Annealing-box.



L. LwKNOX ANNEALING BOX.

APPLICATION FILED 056.31, 1911.

Patented June 4, 1918.

mvzrrron WITNESSES LUTHER L. KNOX, or BELLYEVUE, 'rENNsYLvANm, ASSIGNOR To BnAw-KNoX coM- PANY, or PITTSBURGH, PENNSYLVANIA, A CORPORATION or NEW JERSEY.

ANNEALING-BOX.

Patented June 4, 1918.

Application filed December 31, 1917. Serial No. 209,636.

To all whom it may concern.

Be it known that I, LUTHER L. ,KNOX, a citizen of the United States, residing at Bellevue, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Annealing- Boxes, of which the following is a full, clear,

and exact description, reference being had to boxes, and more particularly to annealing boxes formed from sheet metal.

The object of m invention is to provide a sheet metal annealing box which can be readily manufactured, which is of such construct1on as to permit of expansion and contraction movements without injury to the box, and which will bev durable in service.

Referring to the accompanying ,drawings, the numeral 2 designates the body of the box which is of the usual approximately rectangular form in cross section. This body is preferably formed from a singlesheet of metal, the edges of which are brought together and welded at a suitable point, as at a, at one of the corners. The

7 metal is pressed outwardly'at each corner to form the vertical concavo convex swells 3 of relatively large radii. These swells are connected preferably at both sides and both ends of the box byv transversely extending concavo-convex ribs 4, which are pressed outwardly in the metal.

The cover 5 1s formed in a separate piece which isfitted over the upper end of the body and is preferably welded to the body,

-; thereby forming a practically integral structure. This cover member has the upward swells 6, which radiate from its center toward each corner, their lower portions con forming substantially to the swells 3 in the bed portionof the box. These swells 6 gra ually taper out as they approach the center of the top.

The corner swells provide for relatively free lateral expansion and contraction movements, restrained,- however, to some extent by the tie connections aiiorded by the horizontal ribs 4. The latter ribs while thus acting to the proper extent as tie members render the sides and ends of the box sufficiently elastic to relieve vertical stresses. They also greatly stiffen the body of the box against the tendency to buckle or bulge under the weight of the top.

The corner swells'also provide clearance spaces at the corners of the pile of sheets or other similar-articles being annealed and over which the box is laced in the usual manner. The overlapping portions-of the body and top also provideincreasedstrength and the top member having a depending flange formed with corresponding swells and fitting over the upper'portion of the body of the box, including the swells thereof, and secured thereto, substantially as described.

2 An annealing box comprising a portion and a separately termed top portion, both portions being shaped from sheet metal, the body portion having concavo-convex swells pressed outwardly at its corners and the top member having a depending flange formed with corresponding swells and fitting over the upper portion of the body of the box, including the swells thereof, and secured thereto, the

ribs uniting the corner swells, substantially as describe 7 3. An annealing box comprising a body portion and a separately formed top portion, both ortionsbemg shaped from sheet metal, the ody portion having concavo-convex swells pressed outwardly at its corners and the top member having a depending flange formed with corresponding swells and fitting Iportions being shaped fronisheet y 1: so

,body of'the-box also I having outwardly pressed concavo-convex Q I v 1,268,582

over the vupper portion of the body of the center thereof, and another rib on each Wall box, including the swells thereof, and sebelow the center thereof, substantially as cured thereto, the body of the box also havdescribed.

ing outwardly pressed concave-convex ribs In testimony whereof, I have hereunto set 10 5 muting the corner swells there being one of my hand.

such rlbs on each well of the box above the LUTHER L. KNOX. 

